WO1998054912A1 - Cloaking circuit for use in a radio frequency identification and method of cloaking rfid tags to increase interrogation reliability - Google Patents

Cloaking circuit for use in a radio frequency identification and method of cloaking rfid tags to increase interrogation reliability Download PDF

Info

Publication number
WO1998054912A1
WO1998054912A1 PCT/US1998/010994 US9810994W WO9854912A1 WO 1998054912 A1 WO1998054912 A1 WO 1998054912A1 US 9810994 W US9810994 W US 9810994W WO 9854912 A1 WO9854912 A1 WO 9854912A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
circuit
rfid tag
coupled
switch
Prior art date
Application number
PCT/US1998/010994
Other languages
English (en)
French (fr)
Inventor
James R. Kruest
Original Assignee
Scs Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Scs Corporation filed Critical Scs Corporation
Priority to DE69839938T priority Critical patent/DE69839938D1/de
Priority to CA002286602A priority patent/CA2286602C/en
Priority to JP50096199A priority patent/JP3995724B2/ja
Priority to EP98923849A priority patent/EP0983692B1/de
Publication of WO1998054912A1 publication Critical patent/WO1998054912A1/en

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/0723—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
    • G01S13/75—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems using transponders powered from received waves, e.g. using passive transponders, or using passive reflectors
    • G01S13/751—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems using transponders powered from received waves, e.g. using passive transponders, or using passive reflectors wherein the responder or reflector radiates a coded signal
    • G01S13/758—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems using transponders powered from received waves, e.g. using passive transponders, or using passive reflectors wherein the responder or reflector radiates a coded signal using a signal generator powered by the interrogation signal

Definitions

  • NFET 34 N type field effect transistor 34
  • the gate of transistor 34 is also coupled to through a parallel resistor 36 and parallel capacitor 38 to ground, V ss , .
  • Resistor 36 and capacitor 38 assures that CLOAK must be active for an adequate time to turn on transistor 34 and that transistor 34 is held on for an appropriate time.
  • transistor 34 is on the voltage V DDC is applied across integrated circuit capacitor 40, which is charged to approximately V DDC .
  • Transistor 34 is also coupled to the gate of PFET 42, which is then pulled low and transistor 42 is turned on.
  • Transistor 42 is coupled in series with a high impedance resistor 44 to V ss .

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Near-Field Transmission Systems (AREA)
  • Credit Cards Or The Like (AREA)
  • Radar Systems Or Details Thereof (AREA)
PCT/US1998/010994 1997-05-30 1998-05-29 Cloaking circuit for use in a radio frequency identification and method of cloaking rfid tags to increase interrogation reliability WO1998054912A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE69839938T DE69839938D1 (de) 1997-05-30 1998-05-29 Cloak-schaltung für radiofrequenzidentifikationset abfragezuverlässigkeitserhöhung
CA002286602A CA2286602C (en) 1997-05-30 1998-05-29 Cloaking circuit for use in a radio frequency identification and method of cloaking rfid tags to increase interrogation reliability
JP50096199A JP3995724B2 (ja) 1997-05-30 1998-05-29 無線周波識別で利用するクローキング回路及び質問の信頼性を向上するためにｒｆｉｄタグを隠蔽する方法
EP98923849A EP0983692B1 (de) 1997-05-30 1998-05-29 Cloak-schaltung für radiofrequenzidentifikationsetiketten und rfid etikettenmaskierungsverfahren zur abfragezuverlässigkeitserhöhung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/865,799 1997-05-30
US08/865,799 US5963144A (en) 1997-05-30 1997-05-30 Cloaking circuit for use in a radiofrequency identification and method of cloaking RFID tags to increase interrogation reliability

Publications (1)

Publication Number Publication Date
WO1998054912A1 true WO1998054912A1 (en) 1998-12-03

Family

ID=25346257

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/010994 WO1998054912A1 (en) 1997-05-30 1998-05-29 Cloaking circuit for use in a radio frequency identification and method of cloaking rfid tags to increase interrogation reliability

Country Status (6)

Country Link
US (1) US5963144A (de)
EP (1) EP0983692B1 (de)
JP (1) JP3995724B2 (de)
CA (1) CA2286602C (de)
DE (1) DE69839938D1 (de)
WO (1) WO1998054912A1 (de)

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WO2009140223A1 (en) * 2008-05-13 2009-11-19 Qualcomm Incorporated Reverse link signaling via receive antenna impedance modulation
US8159350B2 (en) 2006-05-15 2012-04-17 International Business Machines Corporation Method and system for localizing objects using passive RFID tags which identifies the RFID with an LED
US8854224B2 (en) 2009-02-10 2014-10-07 Qualcomm Incorporated Conveying device information relating to wireless charging
US8878393B2 (en) 2008-05-13 2014-11-04 Qualcomm Incorporated Wireless power transfer for vehicles
US8912887B2 (en) 2008-12-15 2014-12-16 Cardlab Aps RFID tag
US9312924B2 (en) 2009-02-10 2016-04-12 Qualcomm Incorporated Systems and methods relating to multi-dimensional wireless charging
EP3035230A1 (de) 2014-12-19 2016-06-22 Cardlab ApS Verfahren und Anordnung zum Erzeugen eines Magnetfeldes
US9583953B2 (en) 2009-02-10 2017-02-28 Qualcomm Incorporated Wireless power transfer for portable enclosures
US10095968B2 (en) 2014-12-19 2018-10-09 Cardlabs Aps Method and an assembly for generating a magnetic field and a method of manufacturing an assembly
US10558901B2 (en) 2015-04-17 2020-02-11 Cardlab Aps Device for outputting a magnetic field and a method of outputting a magnetic field

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WO2009140223A1 (en) * 2008-05-13 2009-11-19 Qualcomm Incorporated Reverse link signaling via receive antenna impedance modulation
US8878393B2 (en) 2008-05-13 2014-11-04 Qualcomm Incorporated Wireless power transfer for vehicles
US8892035B2 (en) 2008-05-13 2014-11-18 Qualcomm Incorporated Repeaters for enhancement of wireless power transfer
EP2286521B1 (de) * 2008-05-13 2017-11-22 QUALCOMM Incorporated Verstärker zur verstärkung von drahtloser leistungsübertragung
US8965461B2 (en) 2008-05-13 2015-02-24 Qualcomm Incorporated Reverse link signaling via receive antenna impedance modulation
US9190875B2 (en) 2008-05-13 2015-11-17 Qualcomm Incorporated Method and apparatus with negative resistance in wireless power transfers
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US9236771B2 (en) 2008-05-13 2016-01-12 Qualcomm Incorporated Method and apparatus for adaptive tuning of wireless power transfer
US9954399B2 (en) 2008-05-13 2018-04-24 Qualcomm Incorporated Reverse link signaling via receive antenna impedance modulation
US8912887B2 (en) 2008-12-15 2014-12-16 Cardlab Aps RFID tag
US9583953B2 (en) 2009-02-10 2017-02-28 Qualcomm Incorporated Wireless power transfer for portable enclosures
US9312924B2 (en) 2009-02-10 2016-04-12 Qualcomm Incorporated Systems and methods relating to multi-dimensional wireless charging
US8854224B2 (en) 2009-02-10 2014-10-07 Qualcomm Incorporated Conveying device information relating to wireless charging
EP3035230A1 (de) 2014-12-19 2016-06-22 Cardlab ApS Verfahren und Anordnung zum Erzeugen eines Magnetfeldes
US10614351B2 (en) 2014-12-19 2020-04-07 Cardlab Aps Method and an assembly for generating a magnetic field and a method of manufacturing an assembly
US10095968B2 (en) 2014-12-19 2018-10-09 Cardlabs Aps Method and an assembly for generating a magnetic field and a method of manufacturing an assembly
US10558901B2 (en) 2015-04-17 2020-02-11 Cardlab Aps Device for outputting a magnetic field and a method of outputting a magnetic field

Also Published As

Publication number Publication date
EP0983692A1 (de) 2000-03-08
EP0983692A4 (de) 2001-10-17
DE69839938D1 (de) 2008-10-09
CA2286602A1 (en) 1998-12-03
JP3995724B2 (ja) 2007-10-24
CA2286602C (en) 2007-04-17
US5963144A (en) 1999-10-05
EP0983692B1 (de) 2008-08-27
JP2002513490A (ja) 2002-05-08

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